4tb HDD
I am considering a new iMac 21.5 but need a much bigger hard drive. Can I get a 4 TB INTERNAL drive? If not what is the biggest it can go?
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1TB ATA drive or Fusion drive appears to be the max you can purchase for an internal drive when customizing a 21.5" or 27" iMac online at Apple. The iMac Pro can be special ordered with a 4TB internal drive.
You can add whatever you wish externally of course though I would double-check with Apple prior to purchasing the externals with exact drive sizes and how you are going to use them (OS storage, data file storage, etc) for limitations.